I get mine from Depco Pump Company 727-446-1656 • 1-800-446-1656 • www.depcopump.com.
The pumps are not cheap and surprisingly to have them rebuild the old pump costs more than buying a new one.
Also you can order the pump without a pulley and it saves a couple of dollars and if you get a guy with a commercial account to give you his price it gets even less expensive. Give them a call, they are very friendly and helpful. As a side note, the double pulley option is no longer available so if you have one hang on to it. I had a double pulley with the second belt to operate a Jabsco Bilge Pump and when the pulley broke I spent several years roaming the internet trying to find a replacement. No luck so I wound up abandoning the pump.
1976 42' GBC #482